The largest and the deepest landslides in Serbia occurred on the right valley side of the Danube. General conclusions about landslides along the Danube were obtained on the basis of their ...comprehensive, detailed investigations: the Sloboda bridge in Novi Sad, the Beška bridge, the large settlement of Bocke, and the high-speed railway viaduct in Čortanovci. These areas are actually large, unstable slopes with deep and shallow landslides. Deep landslides consist of several sliding blocks with 20–40 m in depth. All these landslides were formed in clays and sands of the Pliocene age in the decayed crust of these sediments. The general conclusions about landslides presented in this paper will be of great use for the construction of new facilities in the entire unstable area along the Danube, which is about 100 km in length.
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge ...of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, haematite and calcite. The fly ash and slag chemical properties are the most important indicators in the evaluation of their suitability as a building material. The ash and slag chemical composition is composed of the following chemical components: SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, S, Na2O and K2O. Results of laboratory tests show that fly ash and slag have variable chemical, mineralogical and physical properties that are dependent on the natural composition, quality of coal from basin, the manner of combustion and place of ash deposition.
The landslide in the zone of the Sloboda Bridge in Novi Sad is one of the most extensively researched landslides in Serbia because it is large and it poses a threat to the stability of the ...aforementioned bridge over the Danube. At the time of its completion in 1981, this cantilever-spar cable-stayed bridge was the largest in the world, with a central span of 351 m. In the body of the landslide, the bridge is founded on reinforced concrete piles 27 m in length. The measured depth of movement for the first part of the sliding mass is 26 m, while that of the second one is 35 m. The designed drainage structures consist of the following: two wells with diameters of 6,5 m and depths of 22 m, eight drains with lengths of 45 m and a drainage tunnel linking the pressure chamber and the wells.
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge ...of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, haematite and calcite. The fly ash and slag chemical properties are the most important indicators in the evaluation of their suitability as a building material. The ash and slag chemical composition is composed of the following chemical components: SiO^sub 2^, Al^sub 2^O^sub 3^, Fe^sub 2^O^sub 3^, CaO, MgO, SO^sub 3^, S, Na^sub 2^O and K^sub 2^O. Results of laboratory tests show that fly ash and slag have variable chemical, mineralogical and physical properties that are dependent on the natural composition, quality of coal from basin, the manner of combustion and place of ash deposition.
An experimental research of physicomechanical properties of fly ash and ash stabilized with lime and cement, as used in road construction, is presented in the paper. The binder was added in the ...proportion of 2, 4 and 6 % of the total quantity of fly ash. The testing revealed that ash samples with and without binder can be used for improvement of foundation soil and for construction of embankments and subgrade layers, but are not recommended for construction of subbase and base courses. The research is based on the use of fly ash for road construction, i.e. as a substitute for natural materials in construction industry, as this use would save natural resources whose reserves are limited.
Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate-glass, mullite and quartz, which are collected ...by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a binder hydrated lime and cement. The aim of research is to test the possibility of using the fly ash from PPNT A for making elements of road structures (top and bottom layers of the road). Fly ash can be used to create elements for road structures, but it must be taken into account that the embedding is done in segments, isolated from the influence of surface water and groundwater.
U radu je prikazano eksperimentalno istraživanje fizikalno-mehaničkih svojstava letećeg pepela i stabiliziranog pepela s dodatkom vapna i cementa primjenjivog za gradnju cesta. Vezivo je dodavano sa ...2, 4 i 6 % u odnosu na ukupnu količinu letećeg pepela. Nakon izvršenih ispitivanja uočljivo je da uzorci pepela bez dodataka i s dodatkom veziva mogu koristiti za izradu temeljnog tla, nasipa i posteljice, dok za izradu nosivih slojeva nisu preporučljivi. Istraživanje se temelji na korištenju letećeg pepela za izgradnju cesta, odnosno kao zamjena prirodnim materijalima u građevinarstvu, pri čemu se štede prirodni resursi čije su rezerve ograničene.
Klizište u zoni mosta Slobode u Novom Sadu je jedno od najviše istraživanih klizišta u Srbiji iz razloga što predstavlja ozbiljnu prijetnju po stabilnost pomenutog mosta preko Dunava. U vrijeme ...završetka izgradnje 1981. godine, ovaj most s kosim kablovima, bio je na svijetu s najvećim središnjim rasponom od 351 m. U tijelu klizišta, most je temeljen na armiranobetonskim pilotima duljine 27 m. Utvrđena dubina pomicanja za prvi klizni blok iznosi 26 m, a za drugi 35 m. Projektirani drenažni sustav se sastoji od slijedećeg: dva bunara s promjerom od 6,5 m i dubine 22 m, osam drenova duljine do 45 m i drenažnog tunela koji spaja potisnu komoru i bunare.
Elektrofilterski pepeo (leteći pepeo) je jedan od najzastupljenijih otpadnih materijala nastao sagorijevanjem uglja. Čine ga sitnije čestice, sastoji se uglavnom od amorfno-staklastog materijala, ...mulita i kvarca, koji se sakuplja elektrostatičkim separatorima (filterima) iz plinovitih produkata nastalih uslijed sagorijevanja uglja. U radu su prikazana pucolanska svojstva, mehanička svojstva, kemijski i mineralni sastav i svojstva elektrofilterskog pepela dobivenog u procesu sagorijevanja u termoelektrani Nikola Tesla A (TENT A) s dodatkom veziva hidratiziranog vapna i cementa. Cilj istraživanja je mogućnost uporabe elektrofilterskog pepela za izradu elemenata cestovnih konstrukcija (gornji i donji stroj puta). Elektrofilterski pepeo se može primjenjivati za izradu elemenata cestovne konstrukcije, ali treba voditi računa da se ugrađivanje odvija u segmentima, izoliranim od utjecaja površinskih i podzemnih voda.
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